Rough edges sure. No reliable way to delete processed messages. Well, who’s to say they were processed? It’s a persistent queue, stuff sticks around by construction. Besides, this can be managed with tombstones and turning on compaction for that topic.

How would you want to “handle” queue overflow? You’ve either got storage space, or you don’t, this feels a bit like asking “how do I make my bounded queue unbounded”. You don’t, that’s an indicator you’re trying to hold it wrong.

The configs could be a bit easier to drive, but confusing and massive configs is pretty par for the course for Java apps ime.